diff --git a/src/api.ts b/src/api.ts
index d82a99e..8988cf1 100644
--- a/src/api.ts
+++ b/src/api.ts
@@ -125,7 +125,7 @@ window.onload = function() {
     plugins: [
       SwaggerUIBundle.plugins.DownloadUrl
     ],
-    layout: 'StandaloneLayout'
+    layout: "StandaloneLayout",
   });
 }
 `;
\ No newline at end of file
diff --git a/src/index.ts b/src/index.ts
index b7b5e2e..6771860 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -8,7 +8,7 @@ import cors from 'cors';
 import api from './api';
 import db from './db';
 
-// TODO: working demo branch
+// TODO: check header, also in UI
 
 // tell if server is running in debug or production environment
 console.info(process.env.NODE_ENV === 'production' ? '===== PRODUCTION =====' : process.env.NODE_ENV === 'test' ? '' :'===== DEVELOPMENT =====');
@@ -25,7 +25,7 @@ app.disable('x-powered-by');
 const port = process.env.PORT || 3000;
 
 // security headers
-app.use(helmet({
+const defaultHeaderConfig = {
   contentSecurityPolicy: {
     directives: {
       defaultSrc: [`'none'`],
@@ -33,23 +33,27 @@ app.use(helmet({
       formAction: [`'none'`],
       frameAncestors: [`'none'`]
     }
-  }
-}));
+  },
+  frameguard: {
+    action: 'deny'
+  },
+  permittedCrossDomainPolicies: true,
+  refererPolicy: true
+};
+app.use(helmet(defaultHeaderConfig));
 // special CSP header for api-doc
 app.use('/api-doc', helmet.contentSecurityPolicy({
+  ...defaultHeaderConfig,
   directives: {
-    defaultSrc: [`'none'`],
     scriptSrc: [`'self'`],
     connectSrc: [`'self'`],
     styleSrc: [`'self'`, `'unsafe-inline'`],
-    imgSrc: [`'self'`, 'data:'],
-    baseUri: [`'self'`],
-    formAction: [`'none'`],
-    frameAncestors: [`'none'`]
+    imgSrc: [`'self'`, 'data:']
   }
 }));
 // special CSP header for the bosch-logo.svg
 app.use('/static/img/bosch-logo.svg', helmet.contentSecurityPolicy({
+  ...defaultHeaderConfig,
   directives: {
     styleSrc: [`'unsafe-inline'`]
   }
diff --git a/static/styles/swagger-ui.css b/static/styles/swagger-ui.css
index 9372efb..70bf2b8 100644
--- a/static/styles/swagger-ui.css
+++ b/static/styles/swagger-ui.css
@@ -161,6 +161,26 @@ body:after {
   border-color: var(--red);
 }
 
+/*clipboard button*/
+.swagger-ui .copy-to-clipboard {
+  border-radius: 0;
+  top: 19px;
+  height: 28px;
+}
+.swagger-ui .copy-to-clipboard > button {
+  position: relative;
+  bottom: 3px;
+}
+.swagger-ui .curl-command .copy-to-clipboard {
+  border-radius: 0;
+  top: 24px;
+}
+.swagger-ui .curl-command .copy-to-clipboard > button {
+  position: relative;
+  bottom: 7px;
+  right: 1px;
+}
+
 /*download button*/
 .swagger-ui .download-contents {
   border-radius: 0;
@@ -216,6 +236,8 @@ body:after {
 /*code*/
 .swagger-ui .opblock-body pre.microlight {
   border-radius: 0;
+  background: #41444e !important;
+  padding: 0.5em;
 }
 
 .swagger-ui .highlight-code > .microlight {